Design of an IEC 61850 Based Safety Management System for Virtual Power Plants

Shinyuk Kang, Ilwoo Lee Electronics and Telecommunications Research Institute

ameba@etri.re.kr, ilwoo@etri.re.kr

ABSTRACT In this paper, we design an IEC 61850 based safety management system for VPP (Virtual Power Plant) management. The designed system gathers a various type of information such as vibration data, noise level data, temperature value data, current fuel level data, and an oil pressure date from sensors which placed on managed VPP. The main purpose of the safety management system is to detect the risk of a VPP through the gathered information for the stability of the system. This safety management system is designed to receive data based on IEC 61850 MMS protocols in order to manage the various VPP. KEYWORDS Virtual Power Plant, Smart Grid, IEC 61850, Safety Management System, Emergency Generator. 1 INTRODUCTION The energy consumption growth in the world increased for several years. VPP is the one of answers to solve this problem. However, to utilize VPP to overcome of the power supply, the need for VPP management have also been raised. Distributed Energy Resources (DER) communication interface of VPP for safety management accordingly also has emerged as a very important issue. In this paper, VPP target resource was selected emergency generator. It is obliged that emergency generators have been held in buildings over a certain size by law. So there are already installed considerable capacity in the country. And new capacity also continues to increase [1]. This paper proposes a safety

management system based on IEC 61850 data communication for VPP. 2 RELATED STANDARDS This chapter discusses an overview of IEC 61850-7-420 that specifies the information model for VPP. The title of IEC 61850-7-420 is a basic communication structure – distributed energy resources logical nodes. IEC 61850-7-420 defines IEC 61850 information models to be used in the exchange of information with DER, which comprise dispersed generation devices and dispersed storage devices, including reciprocation engines, fuel cells, microturbines, photovoltacics, combined heat and power, and energy storage [3]. The IEC 61850 series define the communication between Intelligent Electronic Devices (IED) in substation and the related system requirements [2]. The IEC 61850 virtualizes actual devices and functions into hierarchical data structures by information modeling, and performs certain functions by data exchange with the Abstract Communication Service Interface (ACSI) between different communication entities. Mapping between different communication protocols is implemented through Specific Communication Service Mapping (SCSM), achieving maximum compatibility and avoiding impacts imposed by the development of communication protocol stacks [2]. IEC 61850-7-4 specifies the information model of devices and functions generally related to common use regarding applications in systems for power utility automation. In particular, it

ISBN: 978-1-941968-34-5 ©2016 SDIWC 47

Proceedings of the Third International Conference on Computer Science, Computer Engineering, and Social Media (CSCESM2016), Thessaloniki, Greece, 2016

specifies the compatible logical node names and data object names for communication between IED. This includes the relationship between logical nodes and data objects [4]. 3 Design of a Safety Management System for VPP The information model for VPP safety management system can be customized by defining additional information such as values measured by environment sensors or unique DER characteristics on the basis of IEC 61850-7-420 information model. Figure 1. Shows core components of an IEC 61850 based safety management system. The designed system consists of the following core components: Emergency generator (VPP) with various sensors, CTTS controller, IEC 61850 Server and Safety management system with a 61850 client.

61850 Server

CTTS

sensors61850 Client

Figure 1. Core Components of an IEC 61850 based

safety management system The CTTS controller gathers vibration, noise, and temperature values measured by environment sensors placed around VPP. The 61850 Server provides a function to get VPP related raw data from a CTTS controller through a serial communication and coverts the delivered Modbus data into IEC 61850 data objects. To improve processing performance of the information data of VPP, designed system use shared memory access. Table. 1 Shows data processing improvement comparison between

designed system and conventional Modbus based system. The data objects are transferred to a 61850 client by Manufacturing Message Specification (MMS) read and write services. [5] The safety management system can show you the various safety management data provided by this MMS services. Table. 1 Shows data processing improvement comparison between proposed system and conventional Modbus based system.

Table 1. Data processing improvement Conventional

Modbus Overall Transfer Time (ms)

Proposed System Overall Transfer Time(ms)

Improvement Ratio (%)

Average 71.02 25.94 63.5 Maximum 132 31 76.5 Minimum 39 24 38.5

The main function of VPP safety management are as follows: - VPP safety data management function - VPP safety alarm management function - VPP safety real-time monitoring function - VPP safety data presenting function VPP safety data management function provides safety data set function, safety data get function, and local database management function. When configuring the data sets, it is important to understand that certain data attribute types are defined by IEC 61850 to have a data change trigger, quality change trigger, or data update trigger [2]. Figure 2. shows monitoring safety data lists and 61850 logical node address. Figure 3. shows monitoring GUI.

Monitoring safety data list 61850 logical node address

Figure 2. Safety data management GUI

ISBN: 978-1-941968-34-5 ©2016 SDIWC 48

Proceedings of the Third International Conference on Computer Science, Computer Engineering, and Social Media (CSCESM2016), Thessaloniki, Greece, 2016

Main Grid

EmergencyGenerator

Load

Monitoring Values

Monitoring Values

Monitoring Values

Figure 3. Real-time Monitoring GUI

VPP safety alarm management function means that checking the values from sensors attached on VPP and shows the status of VPP in a main user interface. As shown in Figure 4, red represents a problem in the VPP and green indicates that VPP is normal status. Figure 5. shows main GUI of safety management system.

Main GUI

Error

Nomal

Figure 4. Alarm management GUI

Figure 5. Main GUI of safety management system

VPP safety real-time monitoring function shows continuous data flow about selected data set. It can be one or more. Figure 6. shows continuous monitoring data.

Figure 6. Monitoring GUI of continuous data flow

With displaying the status of each VPP on the main map, we are able to identify its safety status on the map. 4 Conclusion This paper presents function design and implementation of safety management of emergency generator for VPP. A safety management system provides safety status monitoring function based on IEC 61850 data communication. This also provides the ability to manage the VPP resource efficiently. 5 ACKNOWLEDGEMENT This work was supported by the R&D program of MOTIE and KETEP, Republic of Korea, under Grant of no. 20131010501760, “Development of an Integrated Energy Management System based on VPP” REFERENCES [1] YS Yoo, IW Lee, and JK Choi, “An Emergency

Generator Asset Management for Virtual Power Plant Infrastructure” International Smart Grid Conference, pp.303-305, Oct. 2015.

[2] IEC, “Communication Networks and Systems for Power Utility Automation – Part 7-1: Basic Communication Structure - Principle and Models,” IEC 61850-7-1, 2011.

[3] IEC, “Communication Networks and Systems for

Power Utility Automation – Part 7-420: Basic Comuunication Structure – Distributed Energy Resources Logical Nodes,” IEC 61850-7-420, 2009.

ISBN: 978-1-941968-34-5 ©2016 SDIWC 49

Proceedings of the Third International Conference on Computer Science, Computer Engineering, and Social Media (CSCESM2016), Thessaloniki, Greece, 2016

[4] IEC, “Communication Networks and Systems for Power Utility Automation – Part 7-4: Basic Comuunication Structure – Compatible Logical Node Classes and Data Object Classes,” IEC 61850-7-4, 2010.

[5] TI Hwang, YS Yoo, SY Kang and IW Lee, “Design

of an IEC 61850 Based Communication System for DER Management” International Conference on Electrical, Electronics, Computer Engineering and their Applications, pp.1-5, Nov. 2014.

ISBN: 978-1-941968-34-5 ©2016 SDIWC 50

Proceedings of the Third International Conference on Computer Science, Computer Engineering, and Social Media (CSCESM2016), Thessaloniki, Greece, 2016